mail.safecloudbox.com has no CNAME records.
Question and response
Question
dig mail.safecloudbox.com. NS
Answer
The response has no answer records.
Authority
safecloudbox.com. 3325 SOA ns1.decknet.com. postmaster.decknet.com. 2025062801 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0